Renewable Energy Due Diligence
Executive Summary
Key Takeaways
- ✓ Renewable energy due diligence combines the standard financial, legal, and tax workstreams with a technical workstream centered on the independent resource yield assessment, since the project's core revenue driver depends on this technical basis.
- ✓ The technical workstream should confirm the resource yield assessment's independence, its confidence-level basis (P50/P90), and reconciliation against any available actual operating track record.
- ✓ The commercial workstream should review the PPA or offtake structure's pricing formula, volume terms, tenor, and counterparty credit quality, alongside the merchant tail assumptions applying after contract expiry.
- ✓ Interconnection position — the project's grid connection status, queue position, and any conditions attached to it — should be reviewed as its own distinct diligence item, given its direct effect on achievable revenue timing.
- ✓ Findings across the financial, technical, legal, and commercial workstreams should be reconciled into the financial model explicitly, rather than each workstream's findings remaining siloed in separate reports disconnected from the model's actual assumptions.
Objective¶
This guide covers how due diligence for a renewable energy transaction should be structured within Energy Financial Modelling, building on the general Due Diligence Process and Technical Due Diligence this domain specializes.
The Technical Workstream¶
Renewable energy due diligence adds a technical workstream centered on the resource yield assessment, confirming its independence (prepared by a credible third-party technical consultancy), its confidence-level basis (the specific exceedance figures used and for what purpose), and, where the project has an operating track record, reconciliation against actual demonstrated performance rather than relying solely on the original pre-construction assessment.
The Commercial Workstream¶
The commercial workstream reviews the project's PPA or offtake structure — pricing formula, volume structure, tenor, escalation mechanics, and offtaker counterparty credit quality — alongside the assumptions applying to any merchant tail period following contract expiry.
Interconnection Position¶
The project's grid interconnection status and queue position should be reviewed as their own distinct diligence item, since they directly determine when the asset can actually begin generating revenue, and any conditions attached to the interconnection agreement can materially affect project economics independent of its technical or commercial merits.
Reconciling Findings into the Model¶
Findings across the financial, technical, legal, and commercial workstreams should be reconciled explicitly into the specific financial model assumptions they inform — the technical workstream's yield confirmation feeding the model's resource yield input, the commercial workstream's PPA review feeding the revenue stack — rather than remaining siloed in separate diligence reports disconnected from the model actually used to support the transaction decision.
Common Pitfalls¶
Technical workstream treated as a formality. Accepting the original resource yield assessment without confirming its independence or reconciling it against available operating data understates genuine technical risk.
PPA terms not reconciled to the model. A commercial workstream that reviews PPA terms without confirming the financial model's revenue stack actually reflects those terms leaves a gap between diligence findings and the model relied upon for the decision.
Interconnection risk under-weighted. Treating interconnection status as a formality rather than a distinct diligence item can miss a material risk to the project's actual revenue timing.
Recommended Practices¶
- Confirm the resource yield assessment's independence and reconcile it against actual operating data where available.
- Review the PPA or offtake structure's full terms, not just headline pricing, including merchant tail assumptions.
- Treat interconnection position as its own distinct diligence item.
- Reconcile all workstream findings explicitly into the specific financial model assumptions they inform.
Continue Reading¶
Related Pillars¶
Related Technical Guides¶
Related Glossary¶
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Frequently Asked Questions
How does renewable energy due diligence differ from general transaction due diligence?
It adds a technical workstream centered on the independent resource yield assessment and a commercial workstream focused on the PPA or offtake structure and interconnection position, layered on top of the standard financial, legal, and tax workstreams common to any transaction due diligence process.
What should the technical workstream confirm about the resource yield assessment?
Its independence (prepared by a credible third-party technical consultancy), its confidence-level basis (the specific P50, P90, or other exceedance figures used and for what purpose), and, where the project has operating history, reconciliation against actual demonstrated performance rather than relying solely on the original pre-construction assessment.
What should the commercial workstream review regarding the PPA or offtake structure?
The pricing formula, volume structure (take-or-pay versus as-available), tenor, escalation mechanics, and offtaker counterparty credit quality, alongside the assumptions applying to any merchant tail period following contract expiry.
Why is interconnection position reviewed as its own distinct diligence item?
Because the project's grid connection status and queue position directly determine when the asset can actually begin generating revenue, and any conditions attached to the interconnection agreement (curtailment rights, network upgrade cost responsibility) can materially affect the project's economics independent of its technical or commercial merits.
How should diligence findings feed into the financial model?
Explicitly and directly — each workstream's findings (technical yield confirmation, PPA terms confirmation, interconnection status) should be reconciled into the specific model assumptions they inform, rather than remaining siloed in separate diligence reports disconnected from the model actually used to support the transaction decision.
Related Articles
Energy Financial Modelling
Energy financial modelling is the discipline of building financial models for power generation assets, independent power producers, and renewable energy projects — structured around a technical output schedule and an electricity revenue stack that a standard corporate or general project finance model has no direct equivalent for. This page is the hub for the Knowledge Centre's energy and power modelling content: how a power project model is architected, how electricity markets and dispatch mechanics translate into revenue, and how power purchase agreements, capacity payments, and merchant exposure combine into a project's revenue structure. Technology-specific renewable energy models (solar, wind, storage, hydro, and others), technical and commercial modelling mechanics, and institutional practice for this asset class are indexed here as the domain expands.
Due Diligence Process
The due diligence process ties together every workstream and posture covered elsewhere on this Knowledge Centre into a single, phase-gated timeline — from a non-binding letter of intent through confirmatory diligence, transaction documentation, and the final approval gates a transaction must clear before closing. This guide sets out that end-to-end sequence explicitly, including where investment committee review, lender review, and independent assurance each sit within it, and how transaction documentation accumulates in parallel with the diligence findings that inform it.
Resource Yield Assessment
A resource yield assessment is a technical study, typically prepared by an independent engineer, estimating the expected energy resource available to a generation asset — solar irradiance, wind speed, or hydrology — expressed at defined confidence (exceedance probability) levels such as P50 and P90. Each confidence level serves a distinct modelling purpose, and using the wrong one for a given purpose is a common structural error in renewable energy financial models.
Power Purchase Agreement (PPA) Modelling
A power purchase agreement is rarely a single flat price for the life of a project — it typically carries a specific pricing formula, a defined volume structure (take-or-pay versus as-available), a tenor shorter than the asset's full operating life, and its own escalation mechanics. This guide covers how each of these PPA components should be built explicitly into a power project financial model, and how the model should represent the transition once the PPA expires.
Technical Due Diligence
Technical due diligence, in the transaction context, assesses the physical, engineering, or technology condition of a target's assets — plant and equipment condition, technology infrastructure and intellectual property, or, for an infrastructure or real estate target, the physical asset's engineering and construction condition. This is distinct from the "technical guide" content category this Knowledge Centre itself uses for modelling how-to guides; here, "technical" refers to the engineering or technology substance of the target asset, not the financial model. Its findings translate into capital expenditure and asset condition assumptions in the transaction model.